A complete wordlist for 6-digit OTPs consists of 1,000,000 unique combinations, ranging from 000000 to 999999.
While a full wordlist includes all numerical possibilities, "common" or "predictable" wordlists often prioritize specific patterns that users are more likely to choose or that systems default to. Common 6-Digit PIN Patterns
Research indicates that certain codes appear significantly more often than others in user-selected datasets: Sequential: 123456, 654321 Repeated: 111111, 000000, 999999 Doubled: 123123, 456456
Date-Based: Many users choose birthday patterns such as DDMMYY or MMDDYY. Security Context
Probability: A standard 6-digit OTP has a 1-in-a-million chance of being guessed correctly on the first attempt.
Protection: Most modern systems prevent "brute-forcing" (trying every code in a wordlist) by implementing rate limiting or account lockouts after 3–5 failed attempts.
Lifespan: OTPs are designed to be "one-time" and expire quickly (often within 30–60 seconds), making long wordlists less effective for live attacks.
If you are developing a feature to test security, you can find discussions on generating these lists on developer platforms like Stack Exchange or MDN Web Docs. 6 digit otp wordlist
import itertools # Generate all 6-digit combinations (000000 to 999999) otp_combinations = [":06d".format(i) for i in range(1000000)] # Write to a file for the user to download or see a snippet with open('6_digit_otp_wordlist.txt', 'w') as f: for otp in otp_combinations: f.write(otp + '\n') print(f"Total OTPs generated: len(otp_combinations)") print("Snippet (first 10):", otp_combinations[:10]) Use code with caution. Copied to clipboard
What is the formula to estimate how long it can take to guess an OTP?
A six-digit code has 1,000,000 possible states, hence allows for a 1/1,000,000 chance to correctly guess it on the first try. Mathematics Stack Exchange
What Is a 6-Digit Code? Uses, Security & Best Practices Explained
A 6-digit OTP (One-Time Password) wordlist is a collection of all numeric combinations from 000000 to 999999 , totaling unique entries
. These lists are primarily used by security researchers to test the resilience of authentication systems against brute-force attacks. Core Technical Profile Total Combinations 10 to the sixth power (1,000,000) possibilities. Probability of Guessing : 1 in 1,000,000 (0.0001%) on the first attempt. Common Use Case : Fuzzing and penetration testing to identify missing rate-limiting or account lockout policies. Division Zero (Div0) Notable Wordlists and Sources
Security practitioners often use pre-compiled lists or generators for testing: A complete wordlist for 6-digit OTPs consists of
: A popular collection of security-related lists, including a 6-digits numeric list
: A tool used to generate custom wordlists based on specific patterns (e.g., crunch 6 6 0123456789 -o 6digit.txt Bug Bounty Wordlists : Specialized repositories like Karanxa's GitHub provide these lists for platform-specific testing. Security Vulnerabilities
Reports on 6-digit OTPs often highlight that while 1 million combinations seems large, it is easily brute-forced without proper server-side protections:
OTP bypassed by using luck infused logical thinking bug report
How I broke through 6 digits of security — and landed face-first into a duplicate report. InfoSec Write-ups
kkrypt0nn/wordlists: 📜 Yet another collection of ... - GitHub
Security trainers generate or download wordlist samples to demonstrate why short numeric OTPs are unsafe without proper throttling. 10 attempts/sec) | 1
An attacker with no rate limit can try all 1,000,000 codes in hours or minutes using automated tools. Even with a lockout after 5 failures per user, an attacker might target many different accounts simultaneously.
Let’s compare an ideal OTP system vs. a vulnerable system using a smart wordlist.
| Scenario | Total Possible Codes | Attempts per Second | Time to 50% Success (Full list) | Time to 50% Success (Top 1,000 list) | | :--- | :--- | :--- | :--- | :--- | | Ideal (no rate limit) | 1,000,000 | 100 | ~83 minutes | ~5 seconds | | Ideal (rate limit: 3 attempts/min) | 1,000,000 | 0.05 | ~347 days | ~11 hours | | Vulnerable (no lockout, 10 attempts/sec) | 1,000,000 | 10 | ~14 hours | < 2 minutes |
Key takeaway: A smart wordlist of just 1,000 common OTPs can break into poorly protected accounts in under two minutes.
In the digital age, the 6-digit One-Time Password (OTP) has become a universal security standard. From logging into your bank account to verifying an email change, these six numbers serve as the gateway to your digital identity. Behind the scenes, however, exists a shadowy concept known as the "6-digit OTP wordlist."
To a security professional, this term represents a brute-force attack tool. To a developer, it is a warning about poor implementation. To a hacker, it is a potential key to your accounts. This article provides a complete, technical, and objective breakdown of what 6-digit OTP wordlists are, how they are generated, why they are dangerous, and—most importantly—how to defend against them.